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The Use of Structural-Acoustic Reciprocity Techniques To Assess Potential Environmental (Structural) Damage From Sonic Booms.
Final rept. 17 May-17 Dec 93,
CAMBRIDGE ACOUSTICAL ASSOCIATES INC MA
Pagination or Media Count:
The potential environmental impact of supersonic operations includes damage to conventional and unconventional structures by sonic boom overpressures. The assessment of such damage requires dedicated flyovers for each site at great expense. We show that structural-acoustic techniques may be used to help provide such assessments in their absence. Tests are described whereby transfer functions relating structural response to sonic boom overpressure may be obtained using a stationary acoustic source and appropriate data processing to substitute for the boom. Further structural-acoustic reciprocity is invoked allowing these transfer functions to be determined by measuring the sound radiated by the structure when driven mechanically. Additionally, it is demonstrated that state-of-the-art general purpose computer codes now provide a powerful tool for predicting these transfer functions for complex site geometries and constructions. MM
APPROVED FOR PUBLIC RELEASE